package com.mo.sp06.fallback;

import com.mo.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class OrderFB implements FallbackProvider {
    /*
    设置当前降级类，是针对哪个服务的降级类。
    - item-service :只针对商品服务降级
    - * :针对所有服务都应用当前降级类
    - null ：和*相同
     */
    @Override
    public String getRoute() {
        return "order-service";
    }




    /*
    发送给客户端的降级结果。封装在response对象中
     */

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;  //对象封装了错误信息
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();  //500
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();  //错误信息
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult{code:500, msg"调用商品服务失败"，data：null}
                String json= JsonResult.err().code(500).msg("调用订单服务失败").toString();

                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                //返回协议头类型
                HttpHeaders h=new HttpHeaders();
                h.add("Content-Type", "application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
